金属陶瓷金属相优先腐蚀是目前惰性阳极工业化难点之一,在金属相表面包覆NiFe2O4尖晶石来提高其耐高温熔盐腐蚀性能。包覆实验结果显示,包覆后的颗粒尺寸为2-5μm,且有团聚现象,金属相20Ni-80Cu表面除形成NiFe2O4尖晶石外,可能还含有NiFe2O4-x、Cu2O、NiO、CuxNi1-x、NiyFe1-yFe2O4-a和NizFe1-zO。腐蚀实验表明,金属表面包覆10%、20%、30%、40%和50%NiFe2O4尖晶石后制备的金属陶瓷惰性阳极样品其金属腐蚀层厚度都在20～50μm,其年腐蚀率分别为1.89、1.73、1.65、1.58和2.03cm/a,未包覆金属陶瓷惰性阳极金属腐蚀层厚度为200μm和年腐蚀率为4.15cm/a,说明金属表面包覆NiFe2O4尖晶石能提高惰性阳极的抗熔盐腐蚀性能。
Preferential corrosion of metal phase in cermet inert anode is one of industralization problem, and in order to improve its corrosion resistance to high temperature melt salt electrolyte, NiFe2O4 spinel was coated in the surface of metal phase. Coating experiment result showed that particle size of metal phase after coated is 2- 5μm,and agglomeration phenomenon happened. Besides NiFe2O4 spinel was formed in the surface of metal phase, NiFe2O4-x, CueO7, NiO, Cu. Nil-x, NisFe1-yFe2O4-a and NixFel-x,O were possible found. Moreover, corrosion experiment results indicated that when coating content was 10%,20% ,30%,40% and 50%, respectively, annual wear rate was 1.89,1.73,1.65,1.58 and 2.03cm/a, respectively, and the thickness of metal corrosion layer are all 20-50μm. However, the thickness of metal corrosion layer without coated NiFezO4 spinel was 200ttm and annual wear rate was 4.15cm/a. Thus corrosion resistance to high temperature melt salt elec- trolyte can be improved through coating NiFe2 04 spinel in the surface of metal phase 20Ni-80Cu.
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